Triptorelin:
A synthetic decapeptide
agonist analog of luteinizing hormone releasing hormone (LHRH). Possessing
greater potency than endogenous LHRH, triptorelin reversibly represses
gonadotropin secretion. After chronic, continuous administration, this agent
effects sustained decreases in LH and FSH production and testicular and ovarian
steroidogenesis. Serum testosterone concentrations may fall to levels typically
observed in surgically castrated men (http://www.cancer.gov/)
Triptorelin
is a form of hormone therapy called an LHRH (luteinizing
hormonereleasing hormone) agonist. There are two brands
of the same drug, which are called Decapeptyl SR and
Gonapeptyl Depot. Triptorelin slows down the growth
of prostate cancer cells by blocking a message from
the brain telling the testicles to produce testosterone.
Most prostate cancer cells need testosterone to grow
and spread. (http://www.prostate-cancer.org.uk/)
Leuprorelin and triptorelin, two Gn-RH analogues, are the first drugs to be
licensed in France for preoperative treatment of uterine leiomyoma associated
with anaemia, when a reduction in the size of the leiomyoma is necessary to
facilitate or modify the surgical technique. A solid-blind
placebo-controlled trial of leuprorelin in nearly 300 anaemic women showed no
advantage in terms of the need for non autologous transfusion. Three
solid-blind placebo-controlled trials have shown that leuprorelin reduces the
volume of uterine leiomyomas, but whether or not this facilitates or modifies
the surgical technique is not known. An unblinded trial versus lynestrenol in
non anaemic women showed a superior effect of leuprorelin on the size of the
leiomyoma, but again there were no data on a possible effect on the choice of
surgical technique. In the absence of comparative solid-blind trials, the
observed effects of triptorelin on the choice of surgical technique are
uninterpretable. The adverse effects of leuprorelin are mainly linked to its
hormone effect, i.e. flushing, headache, vaginitis and vaginal dryness. There
are no recent reviews of the adverse effects of triptorelin in this setting. In practice, for anaemic women with leiomyomas requiring surgery, there is no
proof that leuprorelin and triptorelin have any tangible clinical advantages.(http://www.medscape.com/)
Triptorelin
is a synthetic analogue of gonadorelin
(natural GnRH decapeptide) with amino acid (D-tryptophan) substitution in position 6 to
inhibit rapid degradation for long activity. Used as triptorelin pamoate or
acetate form, triptorelin is used as an antineoplastic
in the palliative treatment of prostatic carcinoma, administered
intramuscularly. Other analogues with two substituents in position 6 and 10
include Buserelin, Deslorelin. Goserelin, Histrelin,
Leuprolide, Nafarelin,
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